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This article in AJ

  1. Vol. 62 No. 4, p. 496-498
     
    Received: Nov 24, 1969


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doi:10.2134/agronj1970.00021962006200040019x

Effect of P, CaCO3 and CaSiO3 Fertilization upon Incidence of Corn Smut1

  1. Yusuf N. Tamimi and
  2. James E. Hunter2

Abstract

Abstract

Incidence of corn smut was investigated in two fertilizer (5 ✕ 5 factorial) experiments on P ✕ CaCO3 and P ✕ CaSiO3. Phosphorus rates were O, 84, 168, 336, and 672 kg/ha; CaCO3 and CaSiO3 rates were O, 6.72, 13.44, 26.88, and 53.76 tons (metric)/ha. In both experiments, the effect of P on reduction of corn smut was statistically significant. Disease incidence was reduced from 12.1 and 13.1 to 7.4 and 5.8% with application of 84 kg P/ha in the P ✕ CaCO3 and the P ✕ CaSiO3 experiments, respectively. Further increases in rate of P did not significantly reduce incidence of smut below that of the 84 kg P/ha. Rates of CaCO3 or CaSiO3 did not significantly affect the incidence of corn smut, yet percent infection in the P ✕ CaSiO3 treatments was significantly lower than in the P ✕ CaCO3 treatments (P < .08). There was no significant effect of the P ✕ CaCO3 or P ✕ CaSiO3 interaction on incidence of smut. Soil pH, which ranged from 5.12 to 6.84, was also found to have no significant effect on infection.

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